docs: def handle_407(self, r):
          """Takes the given response and tries digest-auth, if needed."""
  
          num_407_calls = r.request.hooks['response'].count(self.handle_407)
  
          s_auth = r.headers.get('Proxy-authenticate', '')
  
          if 'digest' in s_auth.lower() and num_407_calls < 2:
  
              self.chal = requests.auth.parse_dict_header(s_auth.replace('Digest ', ''))
  
              # Consume content and release the original connection
              # to allow our new request to reuse the same one.
              r.content
              r.raw.release_conn()
  
              r.request.headers['Authorization'] = self.build_digest_header(r.request.method, r.request.url)
              r.request.send(anyway=True)
              _r = r.request.response
              _r.history.append(r)
  
              return _r
  
          return r